
If you play "Happy Dungeons" demo at "ID@Xbox Pre-PAX Open House (Seattle)," we will gift you an original button! We will give out the buttons until all the stock runs out.
Please come check out the event if you live around Seattle in United States!
"Happy Dungeons" Official Site

ID@Xbox Pre-PAX Open House (Seattle)
http://www.idatxbox.com/2015/08/13/idxbox-pre-pax-open-house/